title: Validation of Horne and Ostberg morningness-eveningness questionnaire in a middle-aged population of French workers.
mesh_terms: D001683:Biological Clocks / Q000502:physiology*; D002909:Chronobiology Phenomena; D002940:Circadian Rhythm / Q000502:physiology; D016000:Cluster Analysis; D005602:France; D006801:Humans; D008875:Middle Aged; D017440:Photoperiod; D015203:Reproducibility of Results; D012890:Sleep / Q000502:physiology*; D011795:Surveys and Questionnaires; D014851:Wakefulness / Q000502:physiology*